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Financial risk management - Sensitivity analysis of exchange and interest rate risk (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / $ | Dec. 31, 2017 ARS ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 ARS ($)
Financial risk management |  |  |  |
Net liability position in foreign currency | $ 518.0 |  |  |
Financial liabilities |  | $ 26,220.0 |  | $ 22,912.0
Loans |  |  |  |
Financial risk management |  |  |  |
Financial liabilities |  | 12,235.0 |  | 11,912.0
Currency risk |  |  |  |
Financial risk management |  |  |  |
Net liability position in foreign currency | $ 592.0 | 11,037.0 |  | $ 9,779.0
Estimated variation in exchange rate | $ / $ | 0.10 |  |  |
Estimated variation in consolidated amounts of foreign currency position |  | 59.0 |  |
Net liability position in foreign currency | $ 518.0 | 9,559.0 | $ 595.0 |
Estimated variation in consolidated amounts of foreign currency position on the portion not covered by derivative financial instruments and other assets |  | 52.0 |  |
Interest rate risk |  |  |  |
Financial risk management |  |  |  |
Variation in agreed interest rates (as a percent) | 0.10% |  |  |
Interest rate risk | Bank overdrafts | Pesos |  |  |  |
Financial risk management |  |  |  |
Financial liabilities |  | 135.0 |  |
Effect |  | 0.1 |  |
Interest rate risk | Term Notes | Pesos |  |  |  |
Financial risk management |  |  |  |
Financial liabilities |  | 871.0 |  |
Effect |  | $ 0.9 |  |
Interest rate risk | Term Notes | U.S. dollars |  |  |  |
Financial risk management |  |  |  |
Financial liabilities | $ 78.0 |  |  |
Effect | 1.4 |  |  |
Interest rate risk | Loans | U.S. dollars |  |  |  |
Financial risk management |  |  |  |
Financial liabilities | 500.0 |  |  |
Effect | $ 9.3 |  |  |

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